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5
2. MERITS OF BUS SYSTEM
2-1. Improved Serviceability
Most of the adjustments previously made by resetting vari-
able resistors and/or capacitors can be made on the new chas-
sis by operating the remote control and seeing the results on
the TV screen. This allows seeing adjustments to be made
without removing servicing speed and efficiency.
2-2. Reduction of Parts Count
The use of digital-to-analog converters built into the ICs,
allowing them to be controlled by software, has eliminated
or reduced the requirement for many discrete parts such as
potentiometers and trimmers, etc.
2-3. Quality Control
This central control of the adjustment data makes it easier to
understand, analyze, and review the data, thus improving
quality of the product.
***
1. FEATURE
The TW40F80 is a first PJ-TV with a wide screen aspect
ratio of 16:9 we introduce to North U.S.A. markets.
As the basic chassis N5SS chassis is used.
The future of the model TW40F80 is the use of the N5SS
chassis. This chassis introduces a new bus system, devel-
oped by the PHILIPS company, called the I
2
C (or IIC) bus.
IIC stands for Inter-Integrated Circuit control. This bus co-
ordinates the transfer of data and control between ICs inside
the TV. It is a bi-directional serial bus consisting of two lines,
named SDA (Serial DATA), and SCL (Serial CLOCK). This
bus control system is made possible through the use of digi-
tal-to analog converters built into the ICs, allowing them to
be addressed and controlled by strings of digital instructions.
The TW40F80 is a first wide TV with a double window sys-
tem we introduce to North U.S.A. markets.
The size of the main and sub screens separated in left and
right on the screen is the same as each other. So it is possible
to enjoy two programs or video and TV program at the same
time.
The sub screen is equipped wit 9 screen search function and
this is very convenient convenient to search a program you
desire.
Note:
Only the different points from the manual
“N5SS Chassis” with its file No. 026-9506
are described on this manual. For other parts
common with “N5SS Chassis”, please refer
to the original manual with its File No. 026-
9506.
SECTION I: OUTLINE